Mr. Sylvain Arnaud Profile

Sylvain Arnaud

at Airbus Defence and Space

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Publications (2)

Proceedings Article | 12 July 2023 Open Access

Status of Aeolus-2 mission pre-development activities

Arnaud Heliere, Denny Wernham, Graeme Mason, Geraud De Villele, Bertrand Corselle, Olivier Lecrenier, Thomas Belhadj, Paolo Bravetti, Sylvain Arnaud, Didier Bon, Philippe Lingot, Roland Foulon, Denis Marchais, Mickael Olivier, Alessandro D'Ottavi, Fulvia Verzegnassi, Alessia Mondello, Francesco Coppola, Guglielmo Landi, Hans-Dieter Hoffmann, Dominik Esser, Lucia Perez Prieto, Christian Wührer, Christopher Rivers, Ray Bell

Proceedings Volume 12777, 1277709 (2023) https://doi.org/10.1117/12.2688794

KEYWORDS: Equipment, Transmitters, Design and modelling, Laser applications, Ultraviolet radiation, Beam path, Astronomical imaging, Satellites, Receivers, Laser development

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The European Space Agency’s (ESA) Aeolus satellite was launched on 22 August 2018 from Centre Spatial Guyanais in Kourou, French Guyana. The Aeolus data has been extensively analysed by a number of meteorological centres and found to have a positive impact on NWP forecasts, particularly in the tropics and polar regions. These positive results, along with the successful in-orbit demonstration of the measurement concept and associated technologies utilised on Aeolus, resulted in a statement of interest from EUMETSAT in a future, operational DWL mission in the 2030 to mid-2040’s timeframe and a request to ESA to carry out the necessary pre-development activities for such a mission. This paper will describe the current status of instrument pre-development activities that are being performed in the frame of a potential Aeolus-2 mission. The main inputs for a future Doppler Wind Lidar (DWL) instrument that have been used are: lessons learned from the Aeolus development phases and the in-orbit operations and performance; initial inputs from EUMETSAT including a total mission lifetime of higher than 10-15 years utilizing 2 spacecraft (implying a lifetime of 5.5 years for each) with a launch of the first satellite in 2030, increased robustness and operability of the instrument, and an emphasis on reduction of recurrent costs; the maximum utilization of the demonstrated design heritage; and a number of recommendations for the requirements of a future DWL mission from the Aeolus Scientific Advisory Group (ASAG). These inputs have been collated and combined into a set of preliminary requirements which have been used as the basis for a dedicated Instrument Consolidation Study. An extensive review and trade-off of the above inputs by Airbus Defence & Space, ESA, and independent experts, resulted in the decision to baseline a bi-static instrument design. In addition, three instrument subsystem pre-development activities are currently running: two laser transmitter pre-developments and the pre-development of an improved detector. These developments have the aim to demonstrate that issues identified from the above are resolved and that the technology levels are sufficiently mature for the follow-on DWL mission. The status of these pre-developments will be summarise

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Proceedings Article | 12 July 2023 Open Access

ALADIN UV LIDAR instrument beyond three years in space

Paolo Bravetti, Geraud de Villele, Mickaël Olivier, Sylvain Arnaud, Marc Schillinger, Olivier Lecrenier, Bertrand Corselle, Didier Bon, Sophie Jallade

Proceedings Volume 12777, 1277706 (2023) https://doi.org/10.1117/12.2688590

KEYWORDS: Equipment, Spectrometers, Beam path, LIDAR, Calibration, Astronomical imaging, Laser frequency, Reflection, Spectral response, Ultraviolet radiation

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AEOLUS underwent a long development led by Airbus Defence and Space both for the LIDAR instrument (ALADIN) in France, and the platform in the UK, and was successfully launched into a Sun-synchronous 320 km dawn-dusk orbit by a Vega launcher in August 2018. The ALADIN Doppler wind LIDAR is pioneering the application of such kind of instrument in space and widens the field for space based LIDAR applications. Initially the mission was designed to be a demonstrator but can be actually considered as operational as the data are used routinely with positive impact on the Numerical Weather Predictions (NWP) models after less than one year of operations in-orbit. After four years of operational lifetime, and also thanks to a strong support to in-flight operations, AIRBUS has learnt, together with ESA customer and scientist user teams, many things about ALADIN LIDAR instrument behavior and its performance monitoring in orbit. While temperature and power telemetries monitoring are quite standard in post-delivery, the follow up of the instrument optical alignment and performance is less direct and lesson learnt show it can be however very profitable in particular for the first UV LIDAR in orbit. The ALADIN architecture is recalled with its measurement principle, and its calibration mode and measurement mode, summarizing the available data for monitoring its behavior in orbit: this covers far field pattern from the atmospheric echo, or near field pattern from the atmospheric echo or internal calibration path; this allows to derive alignment stability of the transmitter and receiver part of the instrument. Also, spectral calibration curves trends allow to retrieve information’s about spectrometers stability. In addition, energy monitoring trend are presented with several means available, and linked lessons learnt are driven. As an important contributor for ALADIN performances, the telescope stability is analyzed and thermal correlation presented with representative Earth albedo maps. The telescope stability is shown as a contributor to link budget but also to spectrometers systematic error limitation due to their sensitivity to variations of divergence and line of sight (angle of incidence). As other key element, the CCD sensor "hot pixel" observation is described with the workaround solution operation at instrument allowing to remove their negative impact on measurement data. Overall conclusion is driven with lessons learnt and perspective for a follow on instrument.

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